Commit 1762a59d authored Nov 13, 2012 by Martin Schwenke Committed by Takashi Iwai Nov 13, 2012

ALSA: usb-audio: Add quirk for Focusrite Scarlett 18i6



Probing this device currently fails in snd_usb_audio_probe() because
the call to snd_usb_create_mixer() fails.  This is due to unknown or
non-standard interface descriptor subtypes in parse_audio_unit():

  usbaudio: unit 51: unexpected type 0x09
  snd-usb-audio: probe of 1-8:1.0 failed with error -5

Some people are working around this by recompiling usb-audio with the
call to snd_usb_create_mixer() commented out.  It would be nice to
avoid that.

While the best idea would be to look into the mixer creation failure,
a reasonable short-term solution is to use quirks to only probe the
trouble-free interfaces.  This allows audio and MIDI interfaces to be
used without any obvious issues.

Interface 0 is the main one to ignore.  It contains lots of
control-fu, including the unexpected interface descriptor subtypes.
Interface 5 is for firmware updates and I'm not sure how to get
support for this.  Interface 3 is some sort of control interface that
I don't understand:

    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        3
      bAlternateSetting       0
      bNumEndpoints           0
      bInterfaceClass         1 Audio
      bInterfaceSubClass      1 Control Device
      bInterfaceProtocol      0
      iInterface              0
      AudioControl Interface Descriptor:
        bLength                 9
        bDescriptorType        36
        bDescriptorSubtype      1 (HEADER)
        bcdADC               1.00
        wTotalLength            9
        bInCollection           1
        baInterfaceNr( 0)       1

Signed-off-by: Martin Schwenke <martin@meltin.net>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

parent b7838c2b

sound/usb/quirks-table.h

+52 −0

Original line number	Diff line number	Diff line
		@@ -2955,6 +2955,58 @@ YAMAHA_DEVICE(0x7010, "UB99"),
		}
		},

		{
		/*
		* Focusrite Scarlett 18i6
		*
		* Avoid mixer creation, which otherwise fails because some of
		* the interface descriptor subtypes for interface 0 are
		* unknown. That should be fixed or worked-around but this at
		* least allows the device to be used successfully with a DAW
		* and an external mixer. See comments below about other
		* ignored interfaces.
		*/
		USB_DEVICE(0x1235, 0x8004),
		.driver_info = (unsigned long) & (const struct snd_usb_audio_quirk) {
		.vendor_name = "Focusrite",
		.product_name = "Scarlett 18i6",
		.ifnum = QUIRK_ANY_INTERFACE,
		.type = QUIRK_COMPOSITE,
		.data = & (const struct snd_usb_audio_quirk[]) {
		{
		/* InterfaceSubClass 1 (Control Device) */
		.ifnum = 0,
		.type = QUIRK_IGNORE_INTERFACE
		},
		{
		.ifnum = 1,
		.type = QUIRK_AUDIO_STANDARD_INTERFACE
		},
		{
		.ifnum = 2,
		.type = QUIRK_AUDIO_STANDARD_INTERFACE
		},
		{
		/* InterfaceSubClass 1 (Control Device) */
		.ifnum = 3,
		.type = QUIRK_IGNORE_INTERFACE
		},
		{
		.ifnum = 4,
		.type = QUIRK_MIDI_STANDARD_INTERFACE
		},
		{
		/* InterfaceSubClass 1 (Device Firmware Update) */
		.ifnum = 5,
		.type = QUIRK_IGNORE_INTERFACE
		},
		{
		.ifnum = -1
		}
		}
		}
		},

		{
		/*
		* Some USB MIDI devices don't have an audio control interface,

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